feat: migrate snowflake ids and refresh migrations

src/Application/TakeoutSaaS.Application/App/Merchants/Handlers/CreateMerchantCommandHandler.cs

@@ -0,0 +1,54 @@
+using MediatR;
+using Microsoft.Extensions.Logging;
+using TakeoutSaaS.Application.App.Merchants.Commands;
+using TakeoutSaaS.Application.App.Merchants.Dto;
+using TakeoutSaaS.Domain.Merchants.Entities;
+using TakeoutSaaS.Domain.Merchants.Repositories;
+
+namespace TakeoutSaaS.Application.App.Merchants.Handlers;
+
+/// <summary>
+/// 创建商户命令处理器。
+/// </summary>
+public sealed class CreateMerchantCommandHandler(IMerchantRepository merchantRepository, ILogger<CreateMerchantCommandHandler> logger)
+    : IRequestHandler<CreateMerchantCommand, MerchantDto>
+{
+    private readonly IMerchantRepository _merchantRepository = merchantRepository;
+    private readonly ILogger<CreateMerchantCommandHandler> _logger = logger;
+
+    /// <inheritdoc />
+    public async Task<MerchantDto> Handle(CreateMerchantCommand request, CancellationToken cancellationToken)
+    {
+        var merchant = new Merchant
+        {
+            BrandName = request.BrandName.Trim(),
+            BrandAlias = request.BrandAlias?.Trim(),
+            LogoUrl = request.LogoUrl?.Trim(),
+            Category = request.Category?.Trim(),
+            ContactPhone = request.ContactPhone.Trim(),
+            ContactEmail = request.ContactEmail?.Trim(),
+            Status = request.Status,
+            JoinedAt = DateTime.UtcNow
+        };
+
+        await _merchantRepository.AddMerchantAsync(merchant, cancellationToken);
+        await _merchantRepository.SaveChangesAsync(cancellationToken);
+
+        _logger.LogInformation("创建商户 {MerchantId} - {BrandName}", merchant.Id, merchant.BrandName);
+        return MapToDto(merchant);
+    }
+
+    private static MerchantDto MapToDto(Merchant merchant) => new()
+    {
+        Id = merchant.Id,
+        TenantId = merchant.TenantId,
+        BrandName = merchant.BrandName,
+        BrandAlias = merchant.BrandAlias,
+        LogoUrl = merchant.LogoUrl,
+        Category = merchant.Category,
+        ContactPhone = merchant.ContactPhone,
+        ContactEmail = merchant.ContactEmail,
+        Status = merchant.Status,
+        JoinedAt = merchant.JoinedAt
+    };
+}